Stringing pianos



(No'ModeL) A. J. GILLBSPIE.

STRINGING PIANOS.

No. 275,818. Patented Apr. 17,1883.

Fly 3.

TVITJV'ESSES IJV'VE-NTOR UNITED STATES PATENT OFFICE.

ALFRED J. GILLESPIE, OF ATLANTIC, IOWA.

STRINGING PIANOS.

SPECIFICATION forming part of Letters Patent No. 275,818, dated April17, 1883.

Application filed August 25, 1882. (No model.)

To all whom it may concern:

Be it known that I, ALFRED J. GILLESPIE, a citizen of the United States,residing at Atlantic, in the county of Cass and State of Iowa, haveinvented certain new and useful Improvements in Stringing Pianos; and Ido declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being bad to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

This invention has relation to improvements in the stringing of pianos.

It consists essentially in securing the pianostring in the eye of apulley and passing a supplemental wire around the periphery of saidpulley and drawing on said supplemental wire, as will be described, andin other improve ments, all of which will be hereinafter fullydescribed, and specifically pointed out in the claims.

In the drawings,Figs. l and 2 are side views, showing the improvement;and Fig. 3 is a section of the pulley, as will be described.

(t represents the piano-strin g It represents an agrafi'e.

1) represents the pulley, the eye I) of which is countersunk or roundedon either side, so the string will readily slip as the pulley isrevolved, and also to prevent the string from being out. This pulley ismade convex on both faces, so the string will not engage the sides ofthe pulley as the latter is revolved in the operation of tuning.

b is a groove in the periphery of the pulley.

0 represents the tuning-pin, which I preferably make difierential, asshown in Fig. 1 that is, with one portion having a larger diameter thanthe other.

(1 represents a stretching-wire. One end of this wire is secured to thesmaller portion of the pin a and wrapped several times around the same,and then carried around the pulley I) and brought back and wrappedaround the larger portion of pin 0 in the opposite direction from whichit is wrapped around the smaller portion and secured, as shown. Thus byturning pin 0 so as to wind the wire 01 off the smaller portion of saidpin onto the larger portion the piano-string will be gradually broughtto the desired tension, a great delicacy of adjustment being secured bythe use of the differential pin.

In Fig. 2 I show a modification in the manner of drawing the wire. Inthis construction I secure the string (1 to and wrap it several timesaround the pin, and carry it forward around the pulley b, and then backand secure it to a pin, or in any other manner desired. I prefer,however, to use the differential pin, as by it I secure a more delicateadjustment.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. The combination, with the string-plate and suitable framing, of thepulley b, the string a, having its end made fast to the pulley, atension mechanism, and the stretching-wire (I, passed around the pulleyb and having its ends attached to the tension mechanism, substantiallyas set forth.

2. Inastringed musicalinstrumentprovided with a string-plate andsuitable framing, the combination, with the string a, pulley b, and wire(I, of the differential pin 0, secured on the string-plate and havingthe opposite ends of wire (I wrapped around its larger and smallerportions in opposite directions and secured thereto, substantially asand for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

' ALFRED J. GILLESPIE.

Witnesses:

O. MGDANIELS, FRANK A. GrLLnsrIn.

